JPS6311753B2 - - Google Patents
Info
- Publication number
- JPS6311753B2 JPS6311753B2 JP54118046A JP11804679A JPS6311753B2 JP S6311753 B2 JPS6311753 B2 JP S6311753B2 JP 54118046 A JP54118046 A JP 54118046A JP 11804679 A JP11804679 A JP 11804679A JP S6311753 B2 JPS6311753 B2 JP S6311753B2
- Authority
- JP
- Japan
- Prior art keywords
- insulator
- metal ball
- tip
- hole
- center electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 229910052751 metal Inorganic materials 0.000 claims description 38
- 239000002184 metal Substances 0.000 claims description 38
- 239000012212 insulator Substances 0.000 claims description 27
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 16
- 239000003566 sealing material Substances 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 description 12
- 239000000843 powder Substances 0.000 description 12
- 229910045601 alloy Inorganic materials 0.000 description 10
- 239000000956 alloy Substances 0.000 description 10
- 229910052804 chromium Inorganic materials 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 239000005388 borosilicate glass Substances 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 229910052737 gold Inorganic materials 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 229910052763 palladium Inorganic materials 0.000 description 3
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 239000010970 precious metal Substances 0.000 description 2
- 239000005394 sealing glass Substances 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 229910002696 Ag-Au Inorganic materials 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910002710 Au-Pd Inorganic materials 0.000 description 1
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 229910002593 Fe-Ti Inorganic materials 0.000 description 1
- 229910001252 Pd alloy Inorganic materials 0.000 description 1
- 229910001260 Pt alloy Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 229910002058 ternary alloy Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T21/00—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs
- H01T21/02—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs of sparking plugs
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
- H01T13/39—Selection of materials for electrodes
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Spark Plugs (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は点火プラグの製造方法に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a method of manufacturing a spark plug.
［従来技術］
従来、点火プラグの製法としては、予め中心電
極（例えばNi合金線、Cu芯入のNi合金線から成
る）を所定の棒状に成形し、中空絶縁体内にこの
棒状中心電極及び端子軸を配置し、その後これら
を導電性ガラスシールにより融着シールするのが
一般的である。この場合、必要に応じて棒状中心
電極と端子軸との間に抵抗が配備される。[Prior Art] Conventionally, the manufacturing method for spark plugs involves forming a center electrode (for example, made of a Ni alloy wire or a Ni alloy wire with a Cu core) into a predetermined rod shape, and placing the rod-shaped center electrode and a terminal inside a hollow insulator. It is common to position the shafts and then fusion seal them with a conductive glass seal. In this case, a resistor is provided between the rod-shaped center electrode and the terminal shaft, if necessary.
しかし、この一般的製法にあつては、絶縁体の
軸孔の内径特にその先端発火部の内径と中心電極
の外径との寸法精度は非常に高いものが要求さ
れ、しかも気密性、衝撃強さを確保するために、
シール工程を厳しく管理しなければならない。 However, in this general manufacturing method, extremely high dimensional accuracy is required between the inner diameter of the shaft hole of the insulator, especially the inner diameter of the tip firing part, and the outer diameter of the center electrode, as well as airtightness and impact strength. In order to ensure that
The sealing process must be strictly controlled.
また、他の製法として、電極端の耐久性を向上
させる等のために、棒状中軸（例えば、Niから
成る）先端に小さなチツプ状貴金属片（例えば、
Au―pd合金、Ptから成る）を溶接接合して中心
電極を製造する方法もある。 In addition, as another manufacturing method, in order to improve the durability of the electrode end, a small chip-shaped precious metal piece (for example,
There is also a method of manufacturing the center electrode by welding and joining materials (composed of Au-PD alloy, Pt).
しかし、この製法にあつては、上記一般的製法
における問題点をそのまま保有することに加え
て、面倒で複雑な溶接工程を不可避とし、しかも
中心電極として実質的に機能する容量に比してか
なり多量の貴金属を消費するため高コストとな
る。 However, in addition to having the problems of the general manufacturing method mentioned above, this manufacturing method also requires a troublesome and complicated welding process, and is considerably smaller than the capacity that actually functions as a center electrode. It is expensive because it consumes a large amount of precious metals.
［解決すべき課題］
本発明の課題は、棒状中心電極又は棒状中軸を
基部とする中心電極に関係する不都合を解消する
こと、すなわちこれら棒状体を絶縁体内に組付け
る場合に要求される極めて高い寸法精度の配慮を
不要にし、シール工程の管理を軽減し、しかも面
倒な溶接工程を省略し得る安価な点火プラグの製
法を提供することにある。[Problems to be Solved] An object of the present invention is to eliminate the disadvantages associated with rod-shaped center electrodes or center electrodes whose base is a rod-shaped center shaft, that is, to solve the extremely high To provide an inexpensive manufacturing method for a spark plug that eliminates the need for consideration of dimensional accuracy, reduces sealing process management, and eliminates a troublesome welding process.
［課題解決のための手段］
本発明に係る点火プラグの製法は、中空絶縁体
の先端部に、該絶縁体先端に開口された小孔に臨
んで、該小孔よりも大径でかつ封着温度より高い
融点を有する金属球を挿置し、前記絶縁体の中空
部であつて前記金属球の後部に導電性を有するシ
ール材を充填して端子軸を挿入し、前記金属球及
びシール材を該シール材の封着温度に加熱すると
ともに後方より前記端子軸で押圧することによ
り、前記絶縁体内壁に前記金属球を熱間圧着して
該金属球を前記小孔に備えられた中心電極とする
ことを特徴とする。[Means for Solving the Problems] The method for manufacturing a spark plug according to the present invention includes forming a hole in the tip of a hollow insulator, which faces a small hole opened at the tip of the insulator, and has a diameter larger than the small hole and is sealed. A metal ball having a melting point higher than the bonding temperature is inserted, a conductive sealing material is filled in the hollow part of the insulator at the rear of the metal ball, a terminal shaft is inserted, and the metal ball and seal are inserted. By heating the material to the sealing temperature of the sealing material and pressing it from behind with the terminal shaft, the metal ball is hot-pressed to the wall of the insulator, and the metal ball is attached to the center of the small hole. It is characterized by being an electrode.
［作 用］
こうした特徴を有する本発明製法においては、
金属球の加圧塑性変形によつて形成される中心電
極は絶縁体内壁に密着形成される。また、中心電
極を小さな金属球によつて形成でき、しかも容易
に絶縁体内に陥入された構造となし得る。さら
に、絶縁体先端部への中心電極の形成とシール材
の封着とを同時に行ない得る。[Function] In the production method of the present invention having these characteristics,
A center electrode formed by pressurized plastic deformation of a metal sphere is formed in close contact with the inner wall of the insulator. Furthermore, the center electrode can be formed from a small metal ball, and can be easily invaginated into an insulator. Furthermore, the formation of the center electrode on the tip of the insulator and the sealing of the sealant can be performed simultaneously.
［好適な実施態様］
まず、本発明製法において、中心電極１の材料
となる金属球は、塑性変形前にてほぼ球状ないし
場合によりほぼ楕円回転体状又は任意の多面体で
よく、好ましくはほぼ球状とする。一方、この金
属球が配置される先端小孔２は円柱孔、テーパー
孔、円形その他任意の多角形断面孔等として形成
することが可能である。なお、先端小孔２をテー
パー孔とする場合、小孔の少なくとも一部が先方
及び／又は後方に向かつて拡径するテーパー部と
することが好ましい。要するに、金属球の形状は
電極端として必要とされる形状にするよう選定さ
れ、それに対応して予め形成された絶縁体先端小
孔２の形状に適合して圧着形成される。また金属
球の使用量を低減するために先端小孔２の断面積
は必要十分な大きさに定め、その深さ（即ち絶縁
体３先端の肉厚）も適宜絶縁体３の強度及び絶縁
耐力を考慮して定めることができる。この好まし
い先端小孔径は0.5〜2.0mmφ、その先端小孔の深
さは0.5〜2.5mm程度である。[Preferred Embodiment] First, in the manufacturing method of the present invention, the metal sphere that is the material of the center electrode 1 may be approximately spherical, or in some cases approximately ellipsoidal, or any polyhedron before plastic deformation, preferably approximately spherical. shall be. On the other hand, the tip small hole 2 in which the metal ball is placed can be formed as a cylindrical hole, a tapered hole, a circular hole, or any other polygonal cross-sectional hole. In addition, when the tip small hole 2 is made into a tapered hole, it is preferable that at least a part of the small hole has a tapered portion whose diameter increases toward the front and/or the rear. In short, the shape of the metal ball is selected to be the shape required for the electrode end, and is crimped and formed in accordance with the shape of the insulator tip small hole 2 formed in advance. In addition, in order to reduce the amount of metal balls used, the cross-sectional area of the small tip hole 2 is set to a necessary and sufficient size, and its depth (i.e., the thickness of the tip of the insulator 3) is determined according to the strength and dielectric strength of the insulator 3. It can be determined by considering the following. The diameter of the tip hole is preferably 0.5 to 2.0 mm, and the depth of the tip hole is about 0.5 to 2.5 mm.
金属球の材質としては、Au，Ag又はこれらの
合金、又はこれらとPd又は／及びNi，Cr，Ni―
Crとの合金、又はAg―Pt合金を用いることがで
き、好ましくはAg，Au，Ag―Au，Ag―Au―
Pd，Ag―Pd，Ag―Pt，Ag―Cr，Ag―Au―
Ni，Ag―Au―Cr，Ag―Pd―Ni，Ag―Pd―
Cr，Au―Pd，Au―Cr及びAu―Pd―Crなどの合
金である。組成範囲は例えばAg40〜80wt％残部
Au、或いはこれにPd1〜10wt％又はCr1〜5wt％
含有する合金、Ag70〜95wt％残部Pd、或いはこ
れにCrを１〜5wt％含有する合金、Ag80〜95wt
％残部Pt、さらにはAu50〜95wt％残部Pd、或い
はこれにCrを１〜5wt％含有する合金を用いるこ
とができる。 The material of the metal ball is Au, Ag or an alloy thereof, or these and Pd or/and Ni, Cr, Ni-
An alloy with Cr or an Ag-Pt alloy can be used, preferably Ag, Au, Ag-Au, Ag-Au-
Pd, Ag―Pd, Ag―Pt, Ag―Cr, Ag―Au―
Ni, Ag―Au―Cr, Ag―Pd―Ni, Ag―Pd―
These are alloys such as Cr, Au-Pd, Au-Cr, and Au-Pd-Cr. The composition range is, for example, Ag40-80wt% balance
Au, or this with Pd1~10wt% or Cr1~5wt%
Alloy containing Ag70-95wt% balance Pd, or alloy containing 1-5wt% Cr, Ag80-95wt
% balance Pt, further 50 to 95 wt % Au balance Pd, or an alloy containing 1 to 5 wt % Cr can be used.
金属球の融点は、導電性を有するシール材の封
着温度（950℃〜1200℃）より高いものとし、ま
たこの封着温度範囲内において塑性変形を許容し
て軟化可能なものとすることが好ましいが、但
し、封着温度より高い軟化温度を有する金属を排
除するものではない。 The melting point of the metal sphere should be higher than the sealing temperature (950°C to 1200°C) of the conductive sealing material, and it should be able to soften by allowing plastic deformation within this sealing temperature range. Preferred, but not exclusive, of metals having a softening temperature higher than the sealing temperature.
本発明製法にあつては、この金属球を中空絶縁
体３の先端部において先端小孔２に臨ませて挿置
し、その後部に導電性を有するシール材及び場合
により抵抗材を充填圧縮し（所望によりさらにこ
れらを積層ないし重複）、この充填材の封着ある
いは融着を行う際同時にホツトプレス状態におい
て金属球を先端小孔２に熱間圧着させる。 In the manufacturing method of the present invention, this metal ball is placed at the tip of the hollow insulator 3 so as to face the small tip hole 2, and the rear part thereof is filled and compressed with a conductive sealing material and optionally a resistive material. (These are further laminated or overlapped if desired.) At the same time as sealing or fusing the filler, a metal ball is hot pressed into the tip small hole 2 in a hot press state.
ここに導電性を有するシール材とは、主として
導電性シールガラスフリツト又はこれと耐火物粉
との混合物を含み、公知のものを適宜選択するこ
とができる。導電性シールガラスフリツトには、
約30〜70％の金属粉末と残部ホウ珪酸ガラスから
なるフリツトを用いることが出来、好ましくは金
属成分の10％以上を、FeB及び／又はNiB合金と
したものを用いる。金属成分としてはCu，Ni，
Fe，Cr，Ag，Co，Mo，Ｗ，Fe―Ti合金、Ni―
Cr合金又はこれらの合金を用いることができる。
さらに耐火物粉末としてアルミナ，ジルコン，ジ
ルコニヤ，ムライトなど５〜20％上記導電性シー
ルガラスに混合したものを用いることができる。 The electrically conductive sealing material mainly includes electrically conductive sealing glass frit or a mixture of this and refractory powder, and any known material can be selected as appropriate. The conductive seal glass frit has
A frit consisting of about 30 to 70% metal powder and the balance borosilicate glass can be used, preferably a frit in which 10% or more of the metal component is FeB and/or NiB alloy. Metal components include Cu, Ni,
Fe, Cr, Ag, Co, Mo, W, Fe-Ti alloy, Ni-
A Cr alloy or an alloy thereof can be used.
Further, as a refractory powder, alumina, zircon, zirconia, mullite, etc. mixed in 5 to 20% with the above-mentioned conductive sealing glass can be used.
抵抗材とは、抵抗入り点火プラグとして電波障
害防止のために用いられる組成物を指し、自己封
着性の１〜1.7kΩ程度の比較的抵抗のものから約
３〜7kΩの高抵抗を有するもの（炭素質、粘土質
物質等の骨材の添加）等を包含する。これらシー
ル材及び抵抗材は予め絶縁体３の先端小孔２内端
に挿置された金属球の後方に充填され予備的につ
き固めないし圧縮して封着工程に備える。この圧
縮は通例端子軸４を上方から圧入することにより
行うことができる。 Resistive material refers to a composition used as a resistor-containing spark plug to prevent radio wave interference, and can range from self-sealing and relatively low resistance of about 1 to 1.7 kΩ to high resistance of about 3 to 7 kΩ. (addition of aggregates such as carbonaceous and clay materials), etc. These sealing materials and resistance materials are filled in advance behind a metal ball inserted into the inner end of the small tip hole 2 of the insulator 3, and are preliminarily tamped or compressed in preparation for the sealing process. This compression can usually be performed by press-fitting the terminal shaft 4 from above.
このシール材を封着する際に、予め絶縁体３の
先端に挿入され先端小孔２の内端に挿置されてい
る金属球は封着温度に同時に加熱される。この際
金属球は封着温度以上の融点を有し、かつ一定の
軟化状態即ち塑性変形し易い状態におかれる。通
例端子軸４は前述の圧入の際、出来上り先端位置
よりもやや後方位置にまで圧入されており、さら
に約20〜50Kg／cm2の圧力が加えられて金属球及び
充填材が同時にホツトプレスされる。このことに
より、金属球は塑性変形を受けて先端小孔２中へ
突出し小孔２内空間を充填し孔壁に密着シールさ
れる。その後端はなお軸孔８内に残存し、金属球
から形成された中心電極１の万一の脱落を防止す
る。 When sealing with this sealing material, the metal ball, which has been previously inserted into the tip of the insulator 3 and placed in the inner end of the small tip hole 2, is simultaneously heated to the sealing temperature. At this time, the metal sphere has a melting point higher than the sealing temperature and is placed in a certain softened state, that is, a state where it is easily plastically deformed. Normally, the terminal shaft 4 is press-fitted to a position slightly backward from the finished tip position during the press-fitting described above, and a pressure of about 20 to 50 kg/cm 2 is applied to hot-press the metal ball and the filler material at the same time. . As a result, the metal ball undergoes plastic deformation and protrudes into the small tip hole 2, fills the space inside the small hole 2, and is tightly sealed against the hole wall. The rear end still remains in the shaft hole 8 to prevent the central electrode 1 formed from a metal ball from falling off by any chance.
なお、上記態様において、金属球としてAu，
Ag又はこれらの二元或いはPd等との三元合金を
用いる場合には、粉状物質を充填圧縮の後に約
800〜1200℃に加熱して、端子軸４を熱間圧入す
る。このようにして端子軸４の圧入の際の高圧に
より、適度に軟化した金属球を同時に先端小孔２
内へ圧入することは最も有利な態様である。 In addition, in the above embodiment, Au,
When using Ag or their binary or ternary alloys with Pd, etc., the powder material is filled and compressed and then approximately
The terminal shaft 4 is hot press-fitted by heating to 800 to 1200°C. In this way, due to the high pressure when press-fitting the terminal shaft 4, the appropriately softened metal ball is simultaneously pushed into the tip small hole 2.
Pressing it in is the most advantageous embodiment.
本発明製法によつて得られた点火プラグ９は、
金属球から塑性変形した中心電極１を有し、この
中心電極１は中空絶縁体３の先端小孔２の外部開
口端にほぼ達するまで内部から圧縮変形されて先
端小孔２部位を含む絶縁体３内壁と密着結合して
いる。また、中心電極１は先端小孔２の断面形状
に適合する任意の形状に形成することができる。 The spark plug 9 obtained by the manufacturing method of the present invention is
It has a center electrode 1 which is plastically deformed from a metal sphere, and this center electrode 1 is compressively deformed from the inside until it almost reaches the external open end of the tip hole 2 of the hollow insulator 3, thereby forming an insulator including two portions of the tip hole. 3. Closely connected to the inner wall. Moreover, the center electrode 1 can be formed into any shape that matches the cross-sectional shape of the tip small hole 2.
［発明の効果］
本発明によれば、次のような種々の効果を奏す
る。[Effects of the Invention] According to the present invention, the following various effects can be achieved.
(1) 棒状中心電極又は棒状中軸の加工を省略で
き、絶縁体との適合のための寸法精度を考慮す
る必要がなくなり、中心電極と絶縁体間のシー
ルも特に考慮不要となる。その他、面倒な溶接
工程も必要としない。(1) Machining of the rod-shaped center electrode or rod-shaped center shaft can be omitted, there is no need to consider dimensional accuracy for compatibility with the insulator, and there is no need to particularly consider the seal between the center electrode and the insulator. Additionally, no complicated welding process is required.
(2) 小さな金属球を熱間圧着して中心電極となし
得るので、中心電極のコンパクト化ひいては点
火プラグのコンパクト化に寄与できる。(2) Since the center electrode can be made by hot-pressing a small metal ball, it can contribute to making the center electrode more compact and, in turn, making the spark plug more compact.
(3) 中心電極を絶縁体内に適宜陥入した中心電極
となし得ることから、熱的腐食が少なくかつ熱
引きが良く高温にならないので、Ag等の比較
的低融点の金属又は合金を有利に使用でき、し
たがつて点火プラグのワイドレンジ化を達成で
きる。(3) Since the center electrode can be formed as a center electrode that is appropriately invaginated within the insulator, it is less likely to be thermally corroded, has good heat dissipation, and does not reach high temperatures, making it advantageous to use a metal or alloy with a relatively low melting point, such as Ag. Therefore, a wide range of spark plugs can be achieved.
(4) 中心電極の形成とシール材の封着とを同時に
行なうことができ、点火プラグの製造工程を大
幅に節減できる。(4) Formation of the center electrode and sealing of the sealing material can be performed at the same time, and the manufacturing process of the spark plug can be greatly reduced.
［実施例］
以下本発明の実施例を示す（以下％は重量％を
示す）。[Example] Examples of the present invention are shown below (% indicates weight %).
第１図に示す形状の内径4.7mmφの軸孔８及び
内径1.5mmφ、先端孔部肉厚1.5mmの先端小孔２を
有するセラミツク絶縁体３にAg60％、Au30％及
びPd10％の組成を有する金属球（直径3.0mmφ）
を先端小孔２内端に挿置した。その上へ20メツシ
ユスルーのCu粉60％、Al2O3粉10％及びSiO265
％、B2O330％、Al2O35％のホウ珪酸ガラス粉30
％の混合粉末を0.3ｇ充填し（つき固め）、さらに
抵抗材として上記と同じガラス組成のホウ珪酸ガ
ラス粉40重量部、ジルコニヤ粉30重量部Si3N4粉
30重量部及びメチルセルローズの炭質物質２重量
部の混合粉を0.4ｇ充填し（つき固め）、次いでシ
ールガラスフリツト（金属粉としてCu50％、及
びB2O330％、Al2O35％及び残部SiO2から成るホ
ウ珪酸ガラスフリツトを残部とする）を0.3ｇ充
填し（つき固め）、次いで直径4.0mmφ挿入端に雄
ネジを形成した端子軸４を挿入し、その後800〜
1100℃に全体を加熱し、端子軸４の上部から軸方
向に20〜50Kg／cm2の圧力を印加して、金属球を先
端小孔２内へ圧着させるとともに各粉末の圧着を
行つた。その結果第１図に示す如く、軸孔８及び
先端小孔２において、先方側から中心電極１、シ
ール体５′、抵抗体７、シール体５、端子軸４を
有する点火プラグ９を得た。 The ceramic insulator 3 has a shaft hole 8 with an inner diameter of 4.7 mmφ and a small tip hole 2 with an inner diameter of 1.5 mmφ and a tip hole wall thickness of 1.5 mm as shown in Fig. 1, and has a composition of 60% Ag, 30% Au, and 10% Pd. Metal ball (diameter 3.0mmφ)
was inserted into the inner end of the small tip hole 2. On top of that, add 20 mesh through Cu powder 60%, Al2O3 powder 10% and SiO265
Borosilicate glass powder 30%, B2O3 30 % , Al2O3 5%
% mixed powder (compacted), and as a resistance material, 40 parts by weight of borosilicate glass powder and 30 parts by weight of zirconia powder with the same glass composition as above Si 3 N 4 powder
0.4 g of a mixed powder of 30 parts by weight and 2 parts by weight of a carbonaceous substance of methyl cellulose was filled (compacted), and then sealed glass frit (Cu 50% as metal powder, B 2 O 3 30%, Al 2 O 3 5 0.3g of borosilicate glass frit (with the remainder being SiO 2 ) is filled (compacted), and then a terminal shaft 4 with a male screw formed at the insertion end of 4.0mm diameter is inserted, and then 800~
The whole was heated to 1100° C., and a pressure of 20 to 50 kg/cm 2 was applied in the axial direction from the top of the terminal shaft 4 to press the metal ball into the small tip hole 2 and to press each powder. As a result, as shown in FIG. 1, a spark plug 9 was obtained which had a center electrode 1, a seal body 5', a resistor 7, a seal body 5, and a terminal shaft 4 in the shaft hole 8 and the tip small hole 2 from the front side. .
第１図は本発明製法によつて得られた点火プラ
グの一例を示す概略断面図、第２図は第１図の絶
縁体先端部の拡大断面図、そして第３図〜第６図
は本発明製法によつて得られた点火プラグの他の
例を夫々示す部分断面図、を表わす。
１……中心電極（金属球）、２……小孔、３…
…中空絶縁体、４……端子軸、５，５′……シー
ル体（シール材）、８……軸孔（中空部）。
FIG. 1 is a schematic sectional view showing an example of a spark plug obtained by the manufacturing method of the present invention, FIG. 2 is an enlarged sectional view of the tip of the insulator shown in FIG. 1, and FIGS. FIG. 6 shows partial cross-sectional views showing other examples of spark plugs obtained by the invention manufacturing method. 1... Center electrode (metal ball), 2... Small hole, 3...
...Hollow insulator, 4...Terminal shaft, 5, 5'...Seal body (sealing material), 8...Shaft hole (hollow part).
Claims (1)
された小孔に臨んで、該小孔よりも大径でかつ封
着温度より高い融点を有する金属球を挿置し、 前記絶縁体の中空部であつて前記金属球の後部
に導電性を有するシール材を充填して端子軸を挿
入し、 前記金属球及び前記シール材を該シール材の封
着温度に加熱するとともに後方より前記端子軸で
押圧することにより、前記絶縁体内壁に前記金属
球を熱間圧着して該金属球を前記小孔に備えられ
た中心電極とする、 ことを特徴とする点火プラグの製造方法。[Claims] 1. A metal ball having a larger diameter than the small hole and having a melting point higher than the sealing temperature is inserted into the tip of the hollow insulator, facing the small hole opened at the tip of the insulator. filling the hollow part of the insulator and the rear part of the metal ball with a conductive sealing material and inserting the terminal shaft, and bringing the metal ball and the sealing material to the sealing temperature of the sealing material. The ignition is characterized in that the metal ball is hot-pressed to the wall of the insulator by heating and pressing with the terminal shaft from behind, thereby making the metal ball a center electrode provided in the small hole. Method of manufacturing plugs.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11804679A JPS5642980A (en) | 1979-09-14 | 1979-09-14 | Metal ball electrode ignition plug and production thereof |
| US06/185,956 US4393324A (en) | 1979-09-14 | 1980-09-10 | Spark plug with a sphere-like metal center electrode and manufacturing process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11804679A JPS5642980A (en) | 1979-09-14 | 1979-09-14 | Metal ball electrode ignition plug and production thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5642980A JPS5642980A (en) | 1981-04-21 |
| JPS6311753B2 true JPS6311753B2 (en) | 1988-03-15 |
Family
ID=14726684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11804679A Granted JPS5642980A (en) | 1979-09-14 | 1979-09-14 | Metal ball electrode ignition plug and production thereof |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4393324A (en) |
| JP (1) | JPS5642980A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3447342C2 (en) * | 1984-12-24 | 1994-06-01 | Bosch Gmbh Robert | High-voltage electrodes for the ignition distributor of the ignition system of internal combustion engines and method for producing the same |
| US4778460A (en) * | 1985-10-07 | 1988-10-18 | Kimberly-Clark Corporation | Multilayer nonwoven fabric |
| US4753834A (en) * | 1985-10-07 | 1988-06-28 | Kimberly-Clark Corporation | Nonwoven web with improved softness |
| US4840594A (en) * | 1988-06-06 | 1989-06-20 | Allied-Signal Inc. | Method for manufacturing electrodes for a spark plug |
| EP0360426B1 (en) * | 1988-08-25 | 1993-03-31 | Ngk Spark Plug Co., Ltd | A method of moulding ceramic insulators for use in spark plugs |
| DE19651454C2 (en) * | 1996-12-11 | 2002-04-11 | Bosch Gmbh Robert | spark plug |
| WO2007149839A2 (en) | 2006-06-19 | 2007-12-27 | Federal-Mogul Corporation | Small diameter/long reach spark plug with rimmed hemispherical sparking tip |
| US7969078B2 (en) * | 2008-05-19 | 2011-06-28 | Federal Mogul Ignition Company | Spark ignition device for an internal combustion engine and sparking tip therefor |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2265352A (en) * | 1940-03-29 | 1941-12-09 | Gen Motors Corp | Spark plug |
| US2296045A (en) * | 1941-09-29 | 1942-09-15 | Gen Motors Corp | Spark plug electrode |
| US2505150A (en) * | 1945-03-17 | 1950-04-25 | Gen Motors Corp | Spark plug with auxiliary gap |
| US3235655A (en) * | 1962-12-31 | 1966-02-15 | Gen Motors Corp | Resistor composition and devices embodying same |
| US3349275A (en) * | 1966-06-16 | 1967-10-24 | Gen Motors Corp | Spark plug with a conductive glass seal electrode of glass, copper and zinc |
| US3567658A (en) * | 1967-12-21 | 1971-03-02 | Gen Motors Corp | Resistor composition |
| JPS5619042B2 (en) * | 1973-11-21 | 1981-05-02 | ||
| JPS5141714A (en) * | 1974-10-08 | 1976-04-08 | Ngk Spark Plug Co | Teikofunyutenkasenno jikoshiiruseigarasushitsuteikotaisoseibutsu |
-
1979
- 1979-09-14 JP JP11804679A patent/JPS5642980A/en active Granted
-
1980
- 1980-09-10 US US06/185,956 patent/US4393324A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5642980A (en) | 1981-04-21 |
| US4393324A (en) | 1983-07-12 |
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